A package shipped from Amazon.com moves down a conveyor belt at a UPS building in Louisville, Kentucky, U.S., on Tuesday, April 21, 2015. A Massachusetts couple says it is receiving free mystery packages from Amazon that they didn’t order. Luke SharrettBloomberg

A package shipped from Amazon.com moves down a conveyor belt at a UPS building in Louisville, Kentucky, U.S., on Tuesday, April 21, 2015. A Massachusetts couple says it is receiving free mystery packages from Amazon that they didn’t order. Luke SharrettBloomberg